<!-- 
function calc (form) {
var MHR, LHR, HHR, PMeth, RMeth, HR50, HR60, HR70, HR80, HR90, HR100
HR50 = .5
HR60 = .6
HR70 = .7
HR80 = .8
HR90 = .9
HR100 = 1
  if (form.Age.value < 110) {
     MHR = 220 - form.Age.value
     PMeth = "Percent of Age Predicted "
}
  if (form.Age.value >= 110) {
     MHR = form.Age.value
     PMeth = "Percent of "
}
  if (form.RHR.value > 0) {
     form.THR50.value = (MHR - form.RHR.value) * .5 + form.RHR.value * 1
     form.THR60_1.value = ((MHR - form.RHR.value) * .6 + form.RHR.value * 1)-1
     form.THR60.value = (MHR - form.RHR.value) * .6 + form.RHR.value * 1
     form.THR70_1.value = ((MHR - form.RHR.value) * .7 + form.RHR.value * 1)-1
     form.THR70.value = (MHR - form.RHR.value) * .7 + form.RHR.value * 1
     form.THR80_1.value = ((MHR - form.RHR.value) * .8 + form.RHR.value * 1)-1
     form.THR80.value = (MHR - form.RHR.value) * .8 + form.RHR.value * 1
     form.THR90_1.value = ((MHR - form.RHR.value) * .9 + form.RHR.value * 1)-1
     form.THR90.value = (MHR - form.RHR.value) * .9 + form.RHR.value * 1
     form.THR100.value = MHR
     RMeth = "Heart Rate Reserve"
}
  else {
     form.THR50.value = MHR * .5
     form.THR60_1.value = (MHR * .6)-1
     form.THR60.value = MHR * .6
     form.THR70_1.value = (MHR * .7)-1
     form.THR70.value = MHR * .7
     form.THR80_1.value = (MHR * .8)-1
     form.THR80.value = MHR * .8
     form.THR90_1.value = (MHR * .9)-1
     form.THR90.value = MHR * .9
     form.THR100.value = MHR
     RMeth = "Maximum Heart Rate"
}
form.Method.value = PMeth + RMeth
}
//-->